"The United States stands by Egypt at this difficult time, as we continue to work together to fight the scourge of terrorism," the White House said in a statement.
Prosecutor-General Hisham Barakat is the most senior Egyptian official to die at the hands of militants since an Islamist president was toppled two years ago.
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http://www.reuters.com/article/2015/06/29/us-egypt-violence-usa-idUSKCN0P92I520150629